Spokeswoman Ayn Dietrich says it was not explosive or hazardous and no threat had been made to the agency.
The suspicious device was spotted by building guards about 2 a.m. Monday. Seattle police closed streets around the Abraham Lincoln Building at Third and Seneca until the device was destroyed around 5 a.m. by the bomb squad.
The building is not marked as an FBI field office and there's no indication whether the device was left on the sidewalk accidentally or intentionally.
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